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Finding the Fourth Proportional to 154.39, 212.81 and 105.18

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Solution

The fourth proportional to 154.39, 212.81 and 105.18 is: 144.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.39 : 212.81 = 105.18 : x
  2. Step 2: Convert to fraction form
    154.39/212.81 = 105.18/x
  3. Step 3: Cross multiply
    154.39x = 212.81 × 105.18
  4. Step 4: Simplify right side
    154.39x = 22,382.83
  5. Step 5: Solve for x
    x = 22,382.83/154.39
  6. Step 6: Final answer
    x = 144.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.